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-rw-r--r--src/decoder/DsdLib.cxx171
1 files changed, 171 insertions, 0 deletions
diff --git a/src/decoder/DsdLib.cxx b/src/decoder/DsdLib.cxx
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+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* \file
+ *
+ * This file contains functions used by the DSF and DSDIFF decoders.
+ *
+ */
+
+#include "config.h"
+#include "DsdLib.hxx"
+#include "decoder_api.h"
+#include "util/bit_reverse.h"
+#include "tag_handler.h"
+
+extern "C" {
+#include "tag_id3.h"
+}
+
+#include <unistd.h>
+#include <stdio.h> /* for SEEK_SET, SEEK_CUR */
+
+#ifdef HAVE_ID3TAG
+#include <id3tag.h>
+#endif
+
+bool
+dsdlib_id_equals(const struct dsdlib_id *id, const char *s)
+{
+ assert(id != nullptr);
+ assert(s != nullptr);
+ assert(strlen(s) == sizeof(id->value));
+
+ return memcmp(id->value, s, sizeof(id->value)) == 0;
+}
+
+bool
+dsdlib_read(struct decoder *decoder, struct input_stream *is,
+ void *data, size_t length)
+{
+ size_t nbytes = decoder_read(decoder, is, data, length);
+ return nbytes == length;
+}
+
+/**
+ * Skip the #input_stream to the specified offset.
+ */
+bool
+dsdlib_skip_to(struct decoder *decoder, struct input_stream *is,
+ goffset offset)
+{
+ if (input_stream_is_seekable(is))
+ return input_stream_seek(is, offset, SEEK_SET, nullptr);
+
+ if (input_stream_get_offset(is) > offset)
+ return false;
+
+ char buffer[8192];
+ while (input_stream_get_offset(is) < offset) {
+ size_t length = sizeof(buffer);
+ if (offset - input_stream_get_offset(is) < (goffset)length)
+ length = offset - input_stream_get_offset(is);
+
+ size_t nbytes = decoder_read(decoder, is, buffer, length);
+ if (nbytes == 0)
+ return false;
+ }
+
+ assert(input_stream_get_offset(is) == offset);
+ return true;
+}
+
+/**
+ * Skip some bytes from the #input_stream.
+ */
+bool
+dsdlib_skip(struct decoder *decoder, struct input_stream *is,
+ goffset delta)
+{
+ assert(delta >= 0);
+
+ if (delta == 0)
+ return true;
+
+ if (input_stream_is_seekable(is))
+ return input_stream_seek(is, delta, SEEK_CUR, nullptr);
+
+ char buffer[8192];
+ while (delta > 0) {
+ size_t length = sizeof(buffer);
+ if ((goffset)length > delta)
+ length = delta;
+
+ size_t nbytes = decoder_read(decoder, is, buffer, length);
+ if (nbytes == 0)
+ return false;
+
+ delta -= nbytes;
+ }
+
+ return true;
+}
+
+/**
+ * Add tags from ID3 tag. All tags commonly found in the ID3 tags of
+ * DSF and DSDIFF files are imported
+ */
+
+#ifdef HAVE_ID3TAG
+void
+dsdlib_tag_id3(struct input_stream *is,
+ const struct tag_handler *handler,
+ void *handler_ctx, goffset tagoffset)
+{
+ assert(tagoffset >= 0);
+
+ if (tagoffset == 0)
+ return;
+
+ if (!dsdlib_skip_to(nullptr, is, tagoffset))
+ return;
+
+ struct id3_tag *id3_tag = nullptr;
+ id3_length_t count;
+
+ /* Prevent broken files causing problems */
+ const goffset size = input_stream_get_size(is);
+ const goffset offset = input_stream_get_offset(is);
+ if (offset >= size)
+ return;
+
+ count = size - offset;
+
+ /* Check and limit id3 tag size to prevent a stack overflow */
+ if (count == 0 || count > 4096)
+ return;
+
+ id3_byte_t dsdid3[count];
+ id3_byte_t *dsdid3data;
+ dsdid3data = dsdid3;
+
+ if (!dsdlib_read(nullptr, is, dsdid3data, count))
+ return;
+
+ id3_tag = id3_tag_parse(dsdid3data, count);
+ if (id3_tag == nullptr)
+ return;
+
+ scan_id3_tag(id3_tag, handler, handler_ctx);
+
+ id3_tag_delete(id3_tag);
+
+ return;
+}
+#endif